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[TowerTalk] Shunt Fed Tower - 160 Meter Gamma Match Question

To: <>
Subject: [TowerTalk] Shunt Fed Tower - 160 Meter Gamma Match Question
From: "Chuck" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Mon, 15 Feb 2010 10:35:34 -0600
List-post: <">>
I am trying to shunt feed a tower for 160 meters.  I have a 135' Rohn 55 tower 
with several good sized antennas on it.  Guys are insulated.  I have run an old 
piece of coax up 35' about 2' off the tower for a gamma.  I have about a 150 pf 
variable in series and 200 pf to ground.  Ground is 2 -140 foot radials, 
elevated 10'  (In the past I think I have used larger capacitors for this.)

I do not get any match on the series variable with 200 pf, 100 pf and 0 pf to 

What is the easiest thing to do now?

1.  Shorten the radials?
2.  Increase the series capacitance?
3.  Increase the capacitance to ground?

Is my gamma too short?


Chuck W5PR

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